Revert "[flang][runtime] Add ACCESS library procedure" (#88507)

Reverts #88395

This broke the powerpc buildbot. That build doesn't support using
`std::filesystem` in flang unit tests.

Author: tblah

flang/docs/Intrinsics.md

@@ -657,14 +657,6 @@ CALL CO_REDUCE
 CALL CO_SUM
 ```
 
-### Inquiry Functions
-ACCESS (GNU extension) is not supported on Windows. Otherwise:
-```
-CHARACTER(LEN=*) :: path = 'path/to/file'
-IF (ACCESS(path, 'rwx')) &
-  ...
-```
-
 ## Non-standard intrinsics
 ### PGI
 ```

flang/include/flang/Runtime/extensions.h

@@ -44,12 +44,5 @@ std::int64_t RTNAME(Signal)(std::int64_t number, void (*handler)(int));
 // GNU extension subroutine SLEEP(SECONDS)
 void RTNAME(Sleep)(std::int64_t seconds);
 
-// GNU extension function ACCESS(NAME, MODE)
-// TODO: not supported on Windows
-#ifndef _WIN32
-std::int64_t FORTRAN_PROCEDURE_NAME(access)(const char *name,
-    std::int64_t nameLength, const char *mode, std::int64_t modeLength);
-#endif
-
 } // extern "C"
 #endif // FORTRAN_RUNTIME_EXTENSIONS_H_

flang/runtime/extensions.cpp

@@ -17,7 +17,6 @@
 #include "flang/Runtime/entry-names.h"
 #include "flang/Runtime/io-api.h"
 #include <chrono>
-#include <cstring>
 #include <ctime>
 #include <signal.h>
 #include <thread>
@@ -139,77 +138,5 @@ void RTNAME(Sleep)(std::int64_t seconds) {
   std::this_thread::sleep_for(std::chrono::seconds(seconds));
 }
 
-// TODO: not supported on Windows
-#ifndef _WIN32
-std::int64_t FORTRAN_PROCEDURE_NAME(access)(const char *name,
-    std::int64_t nameLength, const char *mode, std::int64_t modeLength) {
-  std::int64_t ret{-1};
-  if (nameLength <= 0 || modeLength <= 0 || !name || !mode) {
-    return ret;
-  }
-
-  // ensure name is null terminated
-  char *newName{nullptr};
-  if (name[nameLength - 1] != '\0') {
-    newName = static_cast<char *>(std::malloc(nameLength + 1));
-    std::memcpy(newName, name, nameLength);
-    newName[nameLength] = '\0';
-    name = newName;
-  }
-
-  // calculate mode
-  bool read{false};
-  bool write{false};
-  bool execute{false};
-  bool exists{false};
-  int imode{0};
-
-  for (std::int64_t i = 0; i < modeLength; ++i) {
-    switch (mode[i]) {
-    case 'r':
-      read = true;
-      break;
-    case 'w':
-      write = true;
-      break;
-    case 'x':
-      execute = true;
-      break;
-    case ' ':
-      exists = true;
-      break;
-    default:
-      // invalid mode
-      goto cleanup;
-    }
-  }
-  if (!read && !write && !execute && !exists) {
-    // invalid mode
-    goto cleanup;
-  }
-
-  if (!read && !write && !execute) {
-    imode = F_OK;
-  } else {
-    if (read) {
-      imode |= R_OK;
-    }
-    if (write) {
-      imode |= W_OK;
-    }
-    if (execute) {
-      imode |= X_OK;
-    }
-  }
-  ret = access(name, imode);
-
-cleanup:
-  if (newName) {
-    free(newName);
-  }
-  return ret;
-}
-#endif
-
 } // namespace Fortran::runtime
 } // extern "C"